1. Porter, R. R., in The Plasma Proteins, 1, 246 (Academic Press, Inc. New York, 1960).
2. Pauling, L., J. Amer. Chem. Soc., 62, 2643 (1940).
3. Nichol, J. C., and Deutsch, H. F., J. Amer. Chem. Soc., 70, 80 (1948).
4. Kekwick, R. A., Biochem. J., 34, 1248 (1940).
5. Sober, H. A., and Peterson, E. A., Fed. Proc., 17, 1116 (1958).